Blocking IP Address Ranges in CIDR

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...if you wanted to block all IP Addresses except the private ones in the 192.168.X.Y range using CIDR, here is how:

IP Address Ranges;

000.000.000.000 - 000.255.255.255    (reserved)

001.000.000.000 - 192.167.255.255

                  192.168.000.000    (the next number which is the first private IP Address #)

192.168.255.255                (the last number in the private IP Address range)

192.169.000.000 - 255.255.255.254

255.255.255.255 - 255.255.255.255    (reserved)

Same as above, but expressed in CIDR;

1.0.0.0/8

2.0.0.0/7

4.0.0.0/6

8.0.0.0/5

16.0.0.0/4

32.0.0.0/3

64.0.0.0/2

129.0.0.0/8

130.0.0.0/7

132.0.0.0/6

136.0.0.0/5

144.0.0.0/4

160.0.0.0/3

192.0.0.0/9

192.128.0.0/11

192.160.0.0/13

192.169.0.0/16

192.170.0.0/15

192.172.0.0/14

192.176.0.0/12

192.192.0.0/10

193.0.0.0/8

194.0.0.0/7

196.0.0.0/6

200.0.0.0/5

208.0.0.0/4

224.0.0.0/4

240.0.0.0/5

248.0.0.0/6

252.0.0.0/7

254.0.0.0/8

255.0.0.0/9

255.128.0.0/10

255.192.0.0/11

255.224.0.0/12

255.240.0.0/13

255.248.0.0/14

255.252.0.0/15

255.254.0.0/16

255.255.0.0/17

255.255.128.0/18

255.255.192.0/19

255.255.224.0/20

255.255.240.0/21

255.255.248.0/22

255.255.252.0/23

255.255.254.0/24

255.255.255.0/25

255.255.255.128/26

255.255.255.192/27

255.255.255.224/28

255.255.255.240/29

255.255.255.248/30

255.255.255.252/31

References;

  https://en.wikipedia.org/wiki/Reserved_IP_addresses

  https://ip2cidr.com/

...and if you really need it: https://www.ipaddressguide.com/cidr

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